由于热带气旋产生的极端风浪,佛罗里达州西北部海岸受到侵蚀

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
ASM Alauddin Al Azad , Reza Marsooli , Mohammad Jamous , Christian M. Appendini , Pablo Ruiz Salcines , Rodrigo Duran
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引用次数: 0

摘要

热带气旋(tc)对沙质海岸环境构成重大威胁,主要是由于极端的风力产生的海浪。沙滩-沙丘系统作为天然屏障,当被极端海浪侵蚀或破坏时,会大大加剧沿海洪水的风险。佛罗里达州西北部的海湾海岸海滩和沙丘高度暴露于tc产生的波浪中,这可能会对这些自然和基于自然的防御造成严重侵蚀。本研究使用基于物理的形态动力学模型,量化了佛罗里达西北海岸七个地点的极端海浪造成的tc引起的海岸侵蚀危害。该模型采用基于ERA5、NCEP和MERRA2再分析数据集生成的合成tc的波浪参数。结果表明,再分析数据的选择显著影响了估算的侵蚀量,基于era5的合成tc产生的侵蚀量始终低于基于NCEP和MERRA2的合成tc。然而,由于ERA5数据集中的侵蚀回归周期高于其他两个数据集,因此ERA5数据集中的侵蚀回归周期与其他两个数据集的侵蚀回归周期很好地吻合。我们还发现了侵蚀危害的显著空间变异性,在相同的风暴强迫下,仅相隔几公里的剖面就表现出不同的侵蚀响应。我们的分析强调了当地形态特征,如海滩坡度和近岸沙洲大小,在调节极端海浪对海岸侵蚀的影响方面的重要作用。研究结果强调了整体高分辨率,特定地点的危害评估对于有效管理和保护海滩-沙丘系统免受极端海浪事件的影响的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coastal erosion hazards in northwest Florida due to extreme wind waves generated by tropical cyclones
Tropical cyclones (TCs) pose significant threats to sandy coastal environments, largely due to the extreme wind-generated waves. Sandy beach-dune systems, acting as natural barriers, can significantly exacerbate coastal flood risks when eroded or breached by extreme waves. Northwest Florida's Gulf coast beaches and dunes are highly exposed to TC-generated waves, which can cause significant erosion of these natural and nature-based defenses. Using a physics-based morphodynamic model, this study quantifies TC-induced coastal erosion hazards due to extreme waves at seven sites along the northwest coast of Florida. The model is forced by wave parameters derived from synthetic TCs, which are generated based on ERA5, NCEP, and MERRA2 reanalysis datasets. The results indicate that the choice of reanalysis dataset significantly influences the estimated erosion volumes, with ERA5-based synthetic TCs consistently producing lower erosion volumes than those based on NCEP and MERRA2. However, the erosion return periods derived from the ERA5 TC dataset align well with those from the other datasets, due to the higher annual frequency of TCs in the ERA5 dataset compared to the other two datasets. We also found significant spatial variability in erosion hazards, with profiles just a few kilometers apart exhibiting different erosion responses under identical storm forcing. Our analysis highlights the important role of local morphological characteristics, such as beach slope and nearshore sandbar size, in modulating the impact of extreme waves on coastal erosion. The study findings underscore the importance of ensemble high-resolution, site-specific hazard assessments for effectively managing and protecting beach-dune systems against extreme wave events.
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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